AMPHASTAR PHARMACEUTICALS IN (AMPH): Institutional Ownership
Hedge funds and institutional managers reporting a position in AMPH · Health Care. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
14
13F filers
Aggregate Value
$24.9M
Across holders
Last Price
$21.78
2026-06-26
Sector
Health Care
GICS
Holder activity7 new4 added3 reduced
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC CIK 0001037389 | Hedge Fund | 554K | $10.9M | 43.5% | 0.0% | Added | +$180K | Q1 2026 |
| MARSHALL WACE, LLP CIK 0001318757 | Hedge Fund | 187K | $3.7M | 14.7% | 0.0% | Added | +$3.5M | Q1 2026 |
| Qube Research & Technologies Ltd CIK 0001729829 | Hedge Fund | 111K | $3.0M | 12.0% | 0.0% | New | — | Q4 2025 |
| TWO SIGMA INVESTMENTS, LP CIK 0001179392 | Hedge Fund | 138K | $2.7M | 10.8% | 0.0% | Added | +$773K | Q1 2026 |
| BALYASNY ASSET MANAGEMENT LLC CIK 0001218710 | Hedge Fund | 77K | $2.1M | 8.3% | 0.0% | New | — | Q4 2025 |
| Gotham Asset Management, LLC CIK 0001510387 | Hedge Fund | 28K | $745K | 3.0% | 0.0% | New | — | Q4 2025 |
| ExodusPoint Capital Management, LP CIK 0001736225 | Hedge Fund | 15K | $400K | 1.6% | 0.0% | New | — | Q4 2025 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 20K | $390K | 1.6% | 0.0% | Reduced | $-3.9M | Q1 2026 |
| Verition Fund Management LLC CIK 0001454027 | Hedge Fund | 19K | $364K | 1.5% | 0.0% | New | — | Q1 2026 |
| TUDOR INVESTMENT CORP ET AL CIK 0000923093 | Hedge Fund | 13K | $297K | 1.2% | 0.0% | New | — | Q2 2025 |
| Schonfeld Strategic Advisors LLC CIK 0001665241 | Hedge Fund | 10K | $237K | 1.0% | 0.0% | New | — | Q2 2025 |
| Brevan Howard Capital Management LP CIK 0001512857 | Hedge Fund | 12K | $228K | 0.9% | 0.0% | Reduced | $-173K | Q1 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 55 | $1K | 0.0% | 0.0% | Added | +$1K | Q1 2026 |
| Man Group plc CIK 0001637460 | Hedge Fund | 45 | $882 | 0.0% | 0.0% | Reduced | $-200K | Q1 2026 |
Added
Hedge Fund
$10.9M· 43.5% of total· 0.0% port· 554K sh· +$180K QoQ· Q1 2026
Added
Hedge Fund
$3.7M· 14.7% of total· 0.0% port· 187K sh· +$3.5M QoQ· Q1 2026
New
Hedge Fund
$3.0M· 12.0% of total· 0.0% port· 111K sh· — QoQ· Q4 2025
Added
Hedge Fund
$2.7M· 10.8% of total· 0.0% port· 138K sh· +$773K QoQ· Q1 2026
New
Hedge Fund
$2.1M· 8.3% of total· 0.0% port· 77K sh· — QoQ· Q4 2025
New
Hedge Fund
$745K· 3.0% of total· 0.0% port· 28K sh· — QoQ· Q4 2025
New
Hedge Fund
$400K· 1.6% of total· 0.0% port· 15K sh· — QoQ· Q4 2025
Reduced
Hedge Fund
$390K· 1.6% of total· 0.0% port· 20K sh· $-3.9M QoQ· Q1 2026
New
Hedge Fund
$364K· 1.5% of total· 0.0% port· 19K sh· — QoQ· Q1 2026
New
Hedge Fund
$297K· 1.2% of total· 0.0% port· 13K sh· — QoQ· Q2 2025
New
Hedge Fund
$237K· 1.0% of total· 0.0% port· 10K sh· — QoQ· Q2 2025
Reduced
Hedge Fund
$228K· 0.9% of total· 0.0% port· 12K sh· $-173K QoQ· Q1 2026
Added
Hedge Fund
$1K· 0.0% of total· 0.0% port· 55 sh· +$1K QoQ· Q1 2026
Reduced
Hedge Fund
$882· 0.0% of total· 0.0% port· 45 sh· $-200K QoQ· Q1 2026